Couldn't in sentence A means "I was not able to" It is not possibility at all. It is inability. Could have in sentence B means possibility in the past.
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tenjingIf I say, " I talked to him because I could hear him clearly ",does it mean I was able to hear him(showing ability in the past).Yes.
tenjingBut I don't think hearing someone is a ability? What is ability? For me ability means if one person can't do what other does,Yes. Some people are not able to see. They are blind
tenjing Thank you. Are you Ms. Or Mr. ?Are you able to guess by looking at my avatar?